Locomotive whistle



J. G. BLUNT LOGOIOTIVE WHISTLE Feb. 19, 1929.

Filed Nov. 19, 1627 FIG.1:-

Patented F eh. 19, 1929.

- UNITED STATES JAMES 6. Emma, orscHENEo'rADY, NEW YORK.

LOCOMOTIVE WHISTLE.-

A pplication filed November 19, 1927. Serial No. 234,823.

This invention relates to locomotive whistles, and particularly to whistles of such charactor as can be operated, at the option of the engineer, either by mechanical means, such as rods and levers, or by fluid pressure, and has for an object to promote a whistle of such type,

which embodies a minimum number of parts; which is of'compact, durable, and economical construction; and which is highly ellieient in operation.

There have heretofore been used, in com mon practice,locomotlve whlstles, adapted to be operated from the cab, either mechanically, such as by levers and rods; or by fluid pressure. Such whistles have embodied a large number of complicated parts, and a large number of jointures which must be maintained steam tight, and, a result, have been expensive to manufacture, and difficult to maintain in working order. The present invention provides a whistle, free from the objections noted.

' The improvement claimed fully set forth. I

,In the accompanying drawing: Figure 1 is a vertical section, taken on the line a a of Fig. 2, of a whistle embodying the invention; Fig. 2, a transverse section of the same, taken on the line Z) 7) of Fig. 1; and, Fig. 3, a similar section, taken on the line a c of Fig. 1.

In the practice of the invention, referring descriptively to the specific embodiment thereof which is herein exemplified, the. chime member, 10, is preferably formed as an integral castin and comprises an outer cylindrical tube, 10, and an inner cylindrical I is hereinafter tube, 10 disposed concentrically of the outer tube. The space between the two tubes is divided into a plurality of chime chambers, 10, by radially extending partitions, 10. The inner tube is prolonged to constitute a cylinder, 10, in which reciprooates the piston, 11, of a piston member. Internal screw threads, 10 are cut, at the bottom of the inner tube, for the attachment of a bowl member, 12. The lower end of the inner tube is also finished with a horizontal circular outwardly extending flange, 10 adapted tofit within the top of a bowl, 12, .of the bowl member, 12, with sufficient clearance fromthe inner face of the side wall of the bowl to provide a passageway, 10, for steam to blow the whistle. A passageway, 10, for steam, leads through one of the chime chambers, 10, into the upper end of the cylinder, 10.

The bowl member, 12, is preferably formed valve, 13/ Boiler steam will then as an integral casting, and comprises the bowl, 12; a threaded nipple, 12*, extending above the bowl, by which the bowl member is attached to the chime member;-a'nd a valve body, 12, comprising a valve seat, 12*, for the the valve stem, 13, makes a snug sliding fit. The exterior of the housing is provided with screw threads, .12, by which the whistle is directly connected to the shell ofa boiler, An outwardly projecting, hollow extension, 12 is provided at one side of the housing, in which is pivoted, on the pin, 14, the bell crank lever, 14. The lower arm of the lever projects through the extension, 12 into aslot, 13", formed in the valve stem, 13. A stud, 12, is screwed into one sideof the housing, and extends into the slot, 13", of the valve stem, to provide a stop, adapted to prevent the valve and stem from dropping into the boiler, when the lever is removed.

The valve stem, 13, is formed with two passageways, 13, through which steam passes from the boiler to the bowl, 12, when the valve, 13, is open. Preferably the valve, 13, and its stem, 13?, are formed as an integral casting.

This piston member is preferably formed as an integral casting, and comprises the piston, 11, which has the form of a relatively long hollow cylinder, and a stem, 11, adapted to bear on the upper endof the valvestem 13*.

The area of the piston, 11, is greater than that of the valve, 13, so that boiler steam,

acting against the piston, will causethe p1S ton to unseat the valve.

When the engineer desires to operate the whistle by fluid pressure, he opens a suitable control valve, mounted in the cab, admitting boiler steam through the passageway, 10, into the cylinder, 10*, whereupon the piston, 11, will be forced downwardly. unseating the ass through the passageways, 13, of the vglve stem, into the bowl, 12 and thence through the passageway, causing the chime memher to resonate. When the engineer closes off steam from the cylinder, 10, the valve, 13, will close, under the pressure of boiler steam, returning the piston, 11, to normal position.

valve, 13, and a cylindrical housing in which The operation of the whistle is as follows:

When the engineer desires to operate the whistle by manual pressure, he moves a suit able lever, mounted in the cab, whereupon the lower arm of the bell crank lever will move the valve, 13, to open position.

Cil

From the foregoing description, it will be apparent that the improved whistle consists of but five major parts, viz: a chime member; a piston member; a bowl memher; a valve member; and a bell crank lever, which parts are preferably formed as integral castings, and can be inexpensively manufactured and assembled. Further important advantages of the improved construction are its great durability, and the small number'of jointures which require to be maintained steam tight.

The invention claimed as newand desired to be secured by Letters Patent is:

1. In a whistle of the character described, the combination of a bowl'shaped member; a tubular casing projecting from the convex side ofthe member, opening at one end into the'concave side ofthe'member, the opposite end being adapted for connection with a sound generating fluid supply conduit; a valve'seated in said opposite end, adapted to be actuated'to open in a direction away from saidmember to admit the fluid, and when released, to close under the pressure of said fluid; a cylinder'at the concave side of said member, communicating with the tubular cas ing; a chime member, overhanging the cy inder; a piston within the cylinder; means, extending through said casing, operativ ly connecting the piston and valve, all of the above'mentioned parts being axially aligned with one another; a conduit for supplying actuating fluid under pressure to the far end of the cylinder relative to the valve, whereby the piston may be actuated in a direction to open the valve, said piston being returned by the closing of the valve when the actuating pressure is removed; and means whereby the valve may be manually operated.

2. In a whistle of the character described,

the combination of a bowl shaped member;

be actuated to open in a'direction'away from said member to adm'itthe fluld, and when released, to close under the pressure of said fluid; a chime member disposed'at'the concave side o'l 'the bowlshaped-member; a cyl-' inder at the concave sideo'f said member, be tween said bowl shaped member and'chim'e member, communicating with the tubular casing; apiston within the cylinder; a Conduitfor supplying actuating fluid under pressure to the far end of the cylinder, relativeto the valve; a two part valve stem extending through said tubular casing, having its "opposits ends connected, respectively,to the plston and valve, said stem parts co-ac tingto open the valve when the actuatin'g fluid is applied, and to close the piston by the pressure of the generating fluid when the'pre'ssure of the actuating fluid is released; and means operatively connected to the valve-stem part connected to the valve, whereby the valve may be manually operated independently of the piston.

JAMES G. BLUNT. 

